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Improved Screw and Stud Machinery

Science Familiarly Illustrated

Treatment of Animal Refuse in Europe

Editorial Summary

Application of the Lever Escapement

By Jules D. Huguenin Vuillemin

Recent American and Foreign Patents

Answers to Correspondents

New Publications

Extension Notices

Swift's Sash-Weight Attachment

A Word About Almanacs

The Value of Mechanical Skill in the Arts

The Teredo, or Ship Worm--Important Trial

Caution

Gravel and Cement Mining

Patent Claims

Increased Force in the Patent Office

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April 06, 1867

See the World from a Different Perspective

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